James Hunt just let us know they have Upstart running on GNU/kFreeBSD -
although not yet doing the /etc/rcS.d early boot tasks like remount root
filesystem read-rewrite - it's a fairly significant development:
https://lists.ubuntu.com/archives/upstart-devel/2014-January/003010.html
AFAIK neither OpenRC nor Upstart have been ported to GNU/Hurd yet, but
I'd guess at least one of them could be ported in time for jessie.
Regards,
--
Steven Chamberlain
steven@pyro.eu.org